# predicateForObjects(from:) Returns a predicate that matches all the objects that were created by any of the provided devices. ``` class func predicateForObjects(from devices: Set) -> NSPredicate ``` ## Parameters `devices` A set of devices that have generated the data for objects stored in the HealthKit store. ## Return Value A predicate that matches all the objects that store data generated by any of the provided devices. ## Discussion When creating the device objects for this predicate, only pass in values for the parameters you need for your query. HealthKit returns all the devices that match the non-`nil` parameters. This gives you a great deal of control when it comes to fine tuning your query. For example, setting the `localIdentifier` and the `firmwareVersion` parameters lets you query for all the samples generated by a specific device running a specific version of the firmware. Just setting the `manufacturer` and `model` casts a much broader net. The following sample uses both the convenience method and a predicate format string to create equivalent predicates. ```objc NSPredicate *fromDevices = [HKQuery predicateForObjectsFromDevices:devices]; NSPredicate *explicitFromDevices = [NSPredicate predicateWithFormat:@"%K IN %@", HKPredicateKeyPathDevice, devices]; ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)